TCS MERN Stack Mid

What is middleware in Express?

Functions that run before the route handler — auth, logging, body parse. ShopNest: jwtAuth middleware runs before POST /orders.

TCS rounds often probe: Scenario .NET + SQL + Angular.

Themes commonly reported in public MNC interview experiences (AmbitionBox / LinkedIn / Glassdoor-style). Practice aloud; keep answers this short in the real round.

More TCS MERN Stack questions

What is the Virtual DOM in React?
Explain useState and useEffect with a real example.
Explain the Node.js event loop simply.
MongoDB vs SQL — when do you pick each?
How do you secure a MERN API?
How do you fix unnecessary React re-renders?

All MERN Stack questions

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